<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 登录头像 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录信息 -->
            <el-form ref="formDataRefs" :model='formData' :rules='formDataRules' label-width="0px" class="login_info">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model='formData.username' prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model='formData.password' prefix-icon="iconfont icon-3702mima" type="password">
                    </el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btn">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="loginFormRef">重置</el-button>
                </el-form-item>
            </el-form>

        </div>
    </div>

</template>

<script>
    export default {
        data() {
            return {
                formData: {
                    username: 'admin',
                    password: '123456'
                },
                formDataRules: {
                    username: [
                        { required: true, message: '请输入登录名称', trigger: 'blur' },
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    password: [
                        { required: true, message: '请输入登录密码', trigger: 'blur' },
                        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                    ]
                }
            }
        },
        methods: {
            loginFormRef() {
                this.$refs.formDataRefs.resetFields();
            },
            login() {
                //登录之前进行预验证
                this.$refs.formDataRefs.validate(async valid => {
                    if (!valid) {
                        return;
                    };
                    const { data: res } = await this.$http.post('login', this.formData);
                    if (res.meta.status != 200) {
                        return this.$message.error('登陆失败');
                    }
                    this.$message.success('登陆成功');
                    //将token存储在sessionStorage中
                    window.sessionStorage.setItem('token', res.data.token);
                    //通过编程式导航跳转到后台主页，路由地址是/home
                    this.$router.push('/home');
                });
            }
        }
    };
</script>

<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }

    .login_box {
        height: 300px;
        width: 450px;
        border-radius: 3px;
        background-color: #fff;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }

    .login_box .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
    }

    .login_box .avatar_box img {
        height: 100%;
        width: 100%;
        border-radius: 50%;
        border: 1px solid #eee;
        background-color: #eee;
    }

    .login_info {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }

    .btn {
        display: flex;
        justify-content: flex-end;
    }
</style>